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One-dimensional air temperature measurements by air resonance enhanced multiphoton Ionization thermometry (ART)

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.455572· OSTI ID:1867529

In this work, a detailed calibration study is performed to establish non-intrusive one-dimensional (1D) rovibrational temperature measurements in unseeded air, based on air resonance enhanced multiphoton ionization thermometry (ART). ART is generated by REMPI (resonance enhanced multi-photon ionization) of molecular oxygen and subsequent avalanche ionization of molecular nitrogen in a single laser pulse. ART signal, the fluorescence from the first negative band of molecular nitrogen, is directly proportional to the 2-photon transition of molecular oxygen C 3 Π (v = 2) ← X 3 Σ (v’=0), which is used to determine temperature. Experimentally, hyperfine structures of the O 2 rotational branches with high temperature sensitivity are selectively excited through a frequency-doubled dye laser. Electron-avalanche ionization of N 2 results in the fluorescence emissions from the first negative bands of N 2 + near 390, 425, and 430nm, which are captured as a 1D line by a gated intensified camera. Post processing of the N 2 + fluorescence yields a 1D thermometry line that is representative of the air temperature. It is demonstrated that the technique provides ART fluorescence of ∼5cm in length in the unseeded air, presenting an attractive thermometry solution for high-speed wind tunnels and other ground test facilities.

Research Organization:
University of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0021382
OSTI ID:
1867529
Alternate ID(s):
OSTI ID: 1980979
Journal Information:
Optics Express, Journal Name: Optics Express Journal Issue: 11 Vol. 30; ISSN 1094-4087; ISSN OPEXFF
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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